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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569e870041409ddfbf6b3e13af6eb4b53e8e09ffcc0c59612db2b18b2b31982a' 
  AND token = '2G2cmL2TM9KkhlNnzCxrmXNj6T72UPNiV2XPXI7Tv6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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