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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c23e8553373960e54b50a31ad3b7db3a550cab5c686c180cad797ef3bcd2f5' 
  AND token = 'UO9AzHnRMpwej0to7RkAT1kU0E6ExU5ggJZqcabJrcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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