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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbee4acd308c2dbc2985ae70ad88c6e98ae11d7ed787f4f45d92bb9794fdf15f' 
  AND token = '1yCNOgNIx2WrIjuBfXyGAH918VK2YyHNuCaN6U2KdLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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