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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '423b2cb4cbacbf710940e6c00253ac2697ccd510107f2b751cc1ba02655f6e10' 
  AND token = 'rnecbIPH8eIC6U7g3ee9iKgvtfkJYfr8JtbKHUmI+6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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