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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ee92740d6d1feea0e6a98419d12d4c56382760f8fb90b8e7d231c272c919cc' 
  AND token = 'k94L+9tOomg1Z+qIfUwNaxArgtMTzHyez+TWsLxA6ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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