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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d93edb63a49fe3be244ddee10ed6acde3bdadc4cadd98e7c0e8aedc235a538a' 
  AND token = 'hPjLfkyAhLor9T3tCDHVBq3n87ndC8a5GCsX9NjhK+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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