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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4a019c7c61250c0bf4258c20483474fdb7f5e4e73c9e19784534a0cccf826e' 
  AND token = 'KfdnwAypOEJ7LE1Y4nPC8/hKoi4lDfmkT6PwOlX5L+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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