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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18cdcf4dada8e7f377331209bcce9686a405cefdda9b5abff75966a3fbc962dd' 
  AND token = 'paZMWs5IRDN4E9hxltQdzLxjwZHam/nilAsp7kxy0uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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