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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5da82a88b49dcef7f5a043d6b331d6f1c03478ad450c3ad52e4e8e997956b9' 
  AND token = 'Asndh27B3AaVmIoj7fyL78wp2q+8IZc0/ZI2gr7se6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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