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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '211a4a8acb080974fef6bbca8b6a989b3de7e5f1181cb48ea98c241c8cddab11' 
  AND token = 'vBqu0cMrLN06kP5JyaqtTZXTmEq3i1eLnTDD5I+2ZNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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