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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07c969fcbb76053f0cb842b095c41eea6294ce0b8ce0eb9842c8b34e34ef305' 
  AND token = '00pPa7GX2rTWxdnNZEI2zAHrFf70R7crIDBqd5ewjT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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