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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec138d4ae91e6d1ed49a99b8eba1cdf40db07ef39f476c8fbaa5ff794e42157' 
  AND token = 'ZiuKM5DzFS/8HupP6d6E41mZt+E3gBU0vDR8hMt0Oeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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