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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c1bed8c74adbe9327838a3ae1d516f553828f72c30465294ddaae948b87acc' 
  AND token = '6MJ3FcY2D2kLIMpH8aG7JK5iv5ZWwWAlrFxowoh22FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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