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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5527577b446555cf5a832460e2e2ea951b2cb32d4811fd1eb5605d29e83e70df' 
  AND token = '6poY0GHAcrNUW7DV5AhyZcWCtsCSTQRHBaJU1OFg3AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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