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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2763d086149a398746b6479224f1549696e4f61c45fbf6f46582f8b6b61db122' 
  AND token = 'To4eA/2WOosU8n46Neh6ZUhtSqgZKzfsTFw7lzPkWBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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