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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e836beac415595dbc41d34f049294068a1d369d2e49d07d08895f69f9747613' 
  AND token = 'B+f0FaEA99BndpxZ1iqr2x6B3ScS2WaCjiCVfmf6zIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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