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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9878375573337b92d5e3950866372f11fd63b23eb75785e06bb08c65c657cb7' 
  AND token = '9lnqt+3PLKGRRbIGGCLCl4Ogd4cxooLMOkcj+4Wl+xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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