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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7029b4b961acd5a21ca0f2b5b467cfd7be59561667d9b75bd914d026e2b63cd' 
  AND token = 'KRak1v/NvLo+fr+YhK7uaaTXajdxXGhzYypwY5paL34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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