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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efeeb7d9bd41f22050ef209bd8dc22cc0cf2bca665560bbb3eb0d2055c3986a9' 
  AND token = 'W2+51t7Sse9XyqZ/myj2vIbTT5rRU2BHAjpxo2GDsOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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