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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de7aade2cebe713e537457966a9110114e37eb80ef71a73b56055c1e551be464' 
  AND token = 'xecLFjovZQXrjy+EpN7JlEuPX1eDo5RrKxSCprg0InM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00129

JSON explain

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