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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16310c97de6b7265a425434ac1037694a6b36f384679a3c21ed2919feb33b56d' 
  AND token = '7adF/61Fxxwkd1woCq1huF7Aj0KRZO4aWLGtUA2y3Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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