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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d41f16424e8bedb9b2d2915ca369648dedacae15b4dce1efef6fe7d4cfd3294' 
  AND token = 'dXCWu7H9cHPOvL7deh4U1lMRI/rhgSGbDPExwfmX6So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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