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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316a56f6cbaf85346af8016c60e83f920692c3b474970a1ef42f2892cead001f' 
  AND token = 'BXk96sboX8BUO7ecnY03XT/BWiUYK8gZZnM4ZLTzQo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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