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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6476b4785ccab0d88f2abf011ad178777aad438fa4ad0f6c13a9ff7ad3e483fc' 
  AND token = 'wsrMj13M3Gak1uJVEjlMcvVJ7eagwNyiYyUu1pGXrM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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