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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9cf7d248cfe73e988a8dcfb7a1410d1bb1b50503857771df96a400556404aef' 
  AND token = 'xhU30FJGfT0fK6b5WOgdujQpijP0dfeX+mOR0k4+Bs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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