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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb12f2e9ec36f71ad9b629ecfb748b325b490ca82b7b8ac4838379daa5c0aa75' 
  AND token = 'obL8ykIVJ5USHobUEuW5XmkMKGnDkL+D3s4qWdIf5R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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