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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38298d3db7a4044c70ee4abeca223b0c6c042896e4a7e3fa9e9a7923c25ffb4d' 
  AND token = 'pKTDf985BE1EIkhDKS4hRSQj4VTAeCTpfUZ6Umi8ACY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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