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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac8381868b05517afe45950ca2271977a9d19c27be5a4c0447e462a72cc71af' 
  AND token = 'vshsDk4xpLg1EuiWHyQHolAI7R0d2CMwXewVzHOOEDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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