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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e41d50ea1fa018baf95fd769388c4f80805b8f5b52b66a7875fa76390f3fa058' 
  AND token = 'PUlnMkdm/0itfFnX7D8q6vVeGrhYSCS5O+u/f157aLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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