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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65dc9f4b11c9f99ac39d8db6b6cf4fa07471b70f3e6d5f7969e0c78a80f53a90' 
  AND token = 'zyU3Yrdvzl9pE5+rZdjHytZTQECStUqJBdrpD58gaJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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