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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82b84863c8b5ec37ffcd808551a47b8888ac2d2a211fdbda578cdb78c3e6449' 
  AND token = 'LkI/ciRk8zLImFsTjUtxnQxmC/tJS9zBt7qxkSO34GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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