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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b048e9cf0a8770c82ca82aa1f62b4d5cb338ebb7a006d71494ebf67e1a7493e1' 
  AND token = '2o2TbJZqXNf3i4ih9+rot4UWJgUDFDXlJZVeX6Wwya8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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