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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3223f5370df9aad85a553a3570178122623eccdf816c299415fe75e3b81e38ec' 
  AND token = 'Nw3wWM8LpWbFk9ca+pACXq+Wpkbmlvfh8T2BXIsWNZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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