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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc4c8fc92a23505dc9367774477adccb1436ea2d8114da387390fd273e2b44a' 
  AND token = 'XtkW4x8hRgckr+Cwu7Fq8TAw6jIwQHEr4ZCzp64BO3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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