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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea78d3ea2b7a1ad322a948c4ebe3a63bc913b4b5f93245e0e209bd36bb22e8f' 
  AND token = '2kjnqTm+PQkhs5q7jXoLY2mAPGHZl1zPK9ccdIqPqIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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