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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15c1bb86847cad55ad29d20f3dba1ec1ac5ca591a6b07c59aa027df849e5231' 
  AND token = 'vSttkWBVekLsCeUNZ3nXfK3rQ8ZUuEmCj/oWUX57EEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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