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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef4cc214cc1c2d0f96d9a68a3bab6a8ab98dbfdbd6287f4ca63c8bdff63736fb' 
  AND token = '76EtNtkNmJkr2/1oZOYaznJ7qiCJ8NkPzWlqDpLjfR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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