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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5dc8d38e06ed4d0bf10025369bcdf4a6b2ee80696aab6bf2f3ae6cd7f58c656' 
  AND token = 'uswVV/zIkjS2JVwQipVcjbLkA4+95Qs5Io2tL1zEdWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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