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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a283b5479e47944c101d635e5222e4d6307698c2857d1c3b967930295610e2f1' 
  AND token = 'UiVmMVguvc0M4TlhPtUXtyVkBjhYnJ0rvu0PfaN5KUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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