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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0eb45c0256fa90e65a7b7a5bcdb59f12f5176d2bd1e0722755152ac881bc938' 
  AND token = 'C+DFmxqCkqMPfdpHeiiHGK5Ysvw4vTMerqMxTca2Z+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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