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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e764bedacfba750ca1d4dd50ad7a256a38f7ef33ba4f7f6abf77a5089f47c53' 
  AND token = 'ueCKmQ9oYQhhc+jIR5hgGSWKvRoOPfnQBO/FT6c0BtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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