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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eff21be07745930df096de746a2f3c01e306bd596fc34799819a27a50203630' 
  AND token = 'Kj4+kA+9mXdc7oxEdq0otqjOhkom5UP8xxyUCoTrE7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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