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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4238e87f907245b925b6e442f666e72adc196eba5aa7b75b1dd41d388dff7892' 
  AND token = '8hUlesYAR8ic/wbnzQF9MNg2Bcbcc5X8bVuep7OLVXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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