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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98339837733e911d918406eb6b2069e4a8a39192f796b8070a17087568e5b546' 
  AND token = 'TlzmXFQ5vlYZq5Kyqzjb8/QyPK8x0ewEkd/2oBNG9sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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