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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fcf0b900ab7f2218884c62741ee5c5cd2737ea0e9c0ee9bf5b859ebbe6dadf0' 
  AND token = 'Y2aiwxQaqCisdOqM7bVNzTC4uj4USYFmq04OSpqFQuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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