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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c260f27f2ad3cc0bcb0c00df0ee847414163a79977f46b130db1fd0d5cc3ddbd' 
  AND token = 'MKsY5gSbRaeDi4PpDw3OVvxBh5kLKd/THmG3xcHrU7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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