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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5dff5bfb984cfea95e79d993286d1a9b02dfd8eb1df399621d53a0d9b7089a6' 
  AND token = '2/9/ijJOO0NVnu0Fht9OPStUWPy66iz+QRnr9Zo2JNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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