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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4db7c88f01a23c40398593760cd944267e183cb21bc7dda1aced57fab54a7ecc' 
  AND token = 'Gxm1POy4JO8sq8Fi5NnZk5R5n1oH39YIG3HBkc+Xeus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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