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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f21f7fb20158c32ef3434be8aec835c4b48bd201129d7934f6a72595e9d2f5b' 
  AND token = '5fb2BY5Mgv8L7a9GhE1m1hKTj9cxbtjOovUrVFT2smY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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