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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961ecfc01cfe28879e41a5af8870424096c765c9f69a13275a4b91a263f139bf' 
  AND token = 'AQEEP+mtp7BP3gGYjaw992g86d2BKpDBXvoyNRqYoeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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