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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece4c1861f498bab250d293a6f2f99d1932b1a50ca2f16eab2b996e4f86bbdcd' 
  AND token = 'tnW8KCy61KKJjmPlYbJ7WPunWndiMvlOiJvBBv3PHAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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