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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2915542a05eeabcf18cd10280757d8b085778b11192bab96d64171be79a59f' 
  AND token = 'sE0uNXXUycmNeGDlp5temg/UO/ZI6Lod5uMb9oi0Bc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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