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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34430be9a54f7a9c204ae4bc594664c048a71718a51fdaab6f2aa85562d6426f' 
  AND token = 'K7xHWJ+W5g37Xt/ztyh36IvIXRb9ojP+GpWvPjE4uiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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