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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c43f19c85abb61aef05b2ef33e224b11231894fbfc569e5af72eb4e2e49d4c79' 
  AND token = 'PEX4Uw0GPVyrWaqVoQ9suK7nciWFBF0upTRK9KCIlos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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