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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8aea4ccbce7bff90c99fba2a7d55b6fe001462be56332683752801c3560954' 
  AND token = 'USi9BoHU0JI/XPd7NJUWOv+GiIfn+A9Bv9rg8gu+5aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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