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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0219ab49fbcadaec05e263fb2de7241d4c30db00aa5940306b63a1cdbe96fdb3' 
  AND token = 'fAHLjg/l4cjjpIzzPzs7D2Yl4+bA/tc0rjVlsbdYxLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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