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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833a372bf1730691929e4d7ae5a518fb321f6fc10a5dfbb74333471d63adf917' 
  AND token = 'll8cp4+QjgmUrXz7pvnGyhORresBdQO6AdThQO9JsaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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