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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a7b26abd4729eeb2d94df3eb6a1f24612ccfd59760e3b6321f991417d24428' 
  AND token = 'J4tGkcABut89c6/YHqGat4jP4B7Mw2w7XfmRUhCcrUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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