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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e76103c7f47e83cdb01120b851e2036a793ede74ca5b12f54291e3a6aeef98' 
  AND token = 'OlFxRuf2R3ZhhF5mn/POCHa26E0olOm2XnM8NyZt/l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}