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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc0663e9a03186ff36638f656cf6f13f3c58ca4ad5bb01e023b42c800c9118eb' 
  AND token = 'bf51hlkte8v/9AH1XMNRJ8FdAnoX9ug9zCg8x3AF9CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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